Steven C. Hayes, PhD, is University of Nevada Foundation Professor of Psychology at the University of Nevada, Reno, and author of numerous books, including Acceptance and Commitment Therapy, Relational Frame Theory, and Get Out of Your Mind and Into Your Life, as well as hundred of articles and book chapters on related subjects.

Dr. Russ Harris is a physician, therapist, and speaker specializing in stress management. He travels nationally and internationally to train individuals and health professionals in the techniques of ACT. Born and educated in England, he now lives in Australia. For more information, visit actmindfully.com.au.

Harville Hendrix, Ph.D., has more than 20 years' experience as an educator and therapist. He specializes in working with couples in private practice, teaching marital therapy to therapists, and conducting couples workshops across the country. Dr. Hendrix is the founder/director of the Institute for Relationship Therapy, based in Dallas and New York City.

John M. Gottman, Ph.D., whose breakthrough study of 2,000 married couples over two decades resulted in this book, is renowned for his ability to predict — with 94 percent accuracy — which people will stay married and which will divorce. He is a professor in the Department of Psychology at the University of Washington in Seattle.

Marshall B. Rosenberg, Ph.D., is a clinical psychologist and the founder of the Center for Nonviolent Communication, an international nonprofit organization that teaches peacemaking skills across five continents, including a number of war-torn areas such as Rwanda, Burundi, Nigeria, Malaysia, Indonesia, Pakistan, Sri Lanka, Sierra Leone, the Middle East, Colombia, Serbia, Croatia, and Northern Ireland.